I. WHAT MAY BE SEEN IN THE HEAVENS:-- The Earth's Figure is seen in the Sky as in a Mirror, 102 II. WHAT MAY BE SEEN ON THE EARTH:-- Causes of the Circulation of the Sap, 132 The Daisy, 138 The Tulip, 152 The Heliotrope, 156 The Anemones, 157 The Arum, 161 The Ranunculaceæ, 165 The Wood-louse, 169 The Dragon-flies, 174 * * * * * BOOK III.--SUMMER. I. WHAT MAY BE SEEN IN THE HEAVENS:-- The Adumbrated Sphere, 191 II. WHAT MAY BE SEEN ON THE EARTH:-- The Perianth, 208 The Calyx, 208 The Corolla, 223 The Prunella, 230 The Scutellaria, 235 The Lilies, 241 The Gentians, 250 An Alpine Excursion, 256 The Pimpernel, 260 The Mole--The Staphylinus--The Mole Cricket, 265 The Earwig, 278 * * * * * BOOK IV.--AUTUMN. CHAP. I. WHAT MAY BE SEEN IN THE HEAVENS:-- The Circle, and the uniform Movement of the Stars (according to the Theory of the Ancients destroyed by Kepler), 289 The Solar Constitution, 292 Result of recent Astronomical Researches, 296 II. WHAT MAY BE SEEN ON THE EARTH:-- Chemical action of Light, 312 Action of Heat, 313 Arable Land, 318 Mushrooms or Agarics, 325 The Number of Vegetable Species distributed over the whole Surface of the Globe, 337 The Harvest Bug, 349 The Cheese Mite, 354 The Number of Animal Species distributed over the whole Surface of the Globe, 356